Homeowners build a shed from a kit by creating a solid foundation, framing the walls, installing roof trusses, adding shingles and then placing the windows and doors. The exact process used in these steps varies by kit manufacturer, but most follow this same pattern.
Kit manufacturers may assume that users already have a solid foundation and may not include information on how to properly create one. Concrete blocks placed level on packed earth provide plenty of support for the structure. Create the floor and frame the walls by following the instructions in the kit, and make sure to add the siding during this step. Many kits require users to screw the sidewalls directly into the floor frame, and it helps to install the wall with the doors last to minimize potential complications arising from the large openings in that wall.
Install the roof trusses by following the kit's instructions, and place the roof onto the building to complete the construction of the basic form. Shingle the roof prior to beginning work with doors and windows. Remember to leave room for a vent, if the kit includes a venting option. Place the windows into the side walls and door area, and secure them according to the instructions. Hang the door on its hinges, and ensure that it closes securely.